Vulnerability in Vllm
CVE-2026-7141
A vulnerability was found in vLLM up to 0.19.0. The affected element is the function has_mamba_layers of the file vllm/v1/kv_cache_interface.py of the component KV Block Handler. Performing a manipulation results in uninitialized resource. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. The exploit has been made public and could be used. The existence of this vulnerability is still disputed at present. The proposed patch did not fix the issue. A 3rd party explains: "The divergence could be explained by a benign and expected vLLM behavior where vLLM server could group concurrent requests together resulting in different input shapes based on varying request arrival time. The differences in grouped input shapes could call different kernels with could produce difference results due to rounding and differences in order of operations. There is an environment variable VLLM_BATCH_INVARIANT=1 for users that desire to have deterministic output with temperature 0.0."
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Vllm
- Vllm — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- vuldb.com/vuln/359740 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/359740/cti (signature, Permissions Required, permissions-required)
- vuldb.com/submit/801297 (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/vllm-project/vllm/issues/39146 (issue-tracking, Issue Tracking)
- github.com/vllm-project/vllm/pull/39283 (issue-tracking, Patch, patch, Issue Tracking)
- github.com/vllm-project/vllm/issues/39146 (issue-tracking, exploit, Issue Tracking)
- github.com/AjAnubolu/vllm/commit/1ad67864c0c20f167929e64c875f5c28e1aad9fd (Patch, patch)
- vuldb.com/cve/CVE-2026-7141 (third-party-advisory)
Frequently asked questions
- What is CVE-2026-7141?
- CVE-2026-7141 is a medium-severity vulnerability in Vllm, classified under Use of Uninitialized Resource. CVSS score: 5.6/10. Published 2026-04-27.
- How severe is CVE-2026-7141?
- Medium severity. CVSS v3 base score is 5.6 out of 10.